EP0019568B1 - Schalldämpfer für Drucklufthammer - Google Patents

Schalldämpfer für Drucklufthammer Download PDF

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Publication number
EP0019568B1
EP0019568B1 EP80420060A EP80420060A EP0019568B1 EP 0019568 B1 EP0019568 B1 EP 0019568B1 EP 80420060 A EP80420060 A EP 80420060A EP 80420060 A EP80420060 A EP 80420060A EP 0019568 B1 EP0019568 B1 EP 0019568B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
casing
rigidly fixed
flange
silencer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80420060A
Other languages
English (en)
French (fr)
Other versions
EP0019568B2 (de
EP0019568A1 (de
Inventor
Roger Montabert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Montabert SAS
Original Assignee
Montabert SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9226058&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0019568(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Montabert SAS filed Critical Montabert SAS
Priority to AT80420060T priority Critical patent/ATE691T1/de
Publication of EP0019568A1 publication Critical patent/EP0019568A1/de
Publication of EP0019568B1 publication Critical patent/EP0019568B1/de
Application granted granted Critical
Publication of EP0019568B2 publication Critical patent/EP0019568B2/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/20—Silencing apparatus characterised by method of silencing by using movable parts having oscillating or vibrating movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11—Arrangements of noise-damping means
    • B25D17/12—Arrangements of noise-damping means of exhaust silencers

Definitions

  • the present invention relates to a silencer for pneumatic hammer, therefore a device attenuating the noise of the exhaust of air, this in the field of pneumatic percussion devices.
  • a pneumatic hammer is a device essentially composed of a cylindrical body having a bore inside which is slidably mounted a piston animated by a reciprocating movement, said piston striking a tool such as a pick or chisel to the end of its downhill run.
  • a valve system generally distributes the compressed air alternately in the upper chamber and the lower chamber of the cylinder, thus causing the movement of the piston.
  • a known solution which is extremely effective consists in carrying out the expansion of the compressed air in an almost closed annular enclosure, formed around the cylinder of the device.
  • Such an enclosure is formed between the outer wall of the cylinder and the inner wall of an envelope surrounding the cylinder, and it has a sufficient volume to receive the air content of each chamber of the device without the final pressure, in said enclosure is substantially higher than atmospheric pressure.
  • the air, expanded to a pressure much lower than 1 bar, can then escape from the enclosure at a speed lower than the speed of sound through a duct of reduced section, and this by using all of the duration of the complete cycle of the device (See, for example DE-A-2 349 296).
  • the present invention aims to eliminate all the shortcomings of current solutions, its aim being thus to avoid the formation of frost in the exhaust channel to the atmosphere without this leading to other drawbacks.
  • the subject of the invention is a silencer for an air hammer, of the kind comprising an annular enclosure where the ar escaping from the cylinder of the apparatus is previously relaxed, before being evacuated to the atmosphere. through a narrow passage, said enclosure being formed between the outer wall of the cylinder and the inner wall of an envelope surrounding the cylinder, silent in which, according to the essential characteristic of the invention, said envelope has its apex integral with a sleeve mounted to slide axially on the upper part of the cylinder, while the lower part of said envelope is tightened so as to delimit the passage of small width and of annular shape around the external wall of the cylinder, the assembly formed by the envelope and the sleeve being suspended elastically from the cylinder.
  • the invention allows the use of an effective expansion chamber without the disadvantage of freezing. Indeed, during the operation of the apparatus, the alternating direction reaction forces and the inertia cause a relative displacement between, on the one hand, the cylinder and, on the other hand, the sleeve integral with the envelope, and this displacement generates, at the level of the passage formed between the external wall of the cylinder and the lower edge of the envelope, a continuous abrasion of the frost in formation.
  • the pneumatic hammer shown in the drawing in longitudinal section, comprises in a known manner a cylinder 1 in the bore 2 of which a piston 3 is slidably mounted.
  • the latter strikes a peak 4 which crosses a closure part 5, closing off the cylinder 1 at its lower part.
  • a conventional valve distribution system causes the admission of compressed air alternately into the cylindrical chamber 6, located above the piston 3, and into the annular chamber 7, located below the piston 3.
  • the latter has a "stepped" shape, and the lateral surface 8 of its portion of larger diameter masks or uncovers, depending on the position of the piston 3, exhaust ports 9 formed radially in the cylinder 1 and opening out, with a part, in the bore 2, on the other hand, in an annular enclosure 10 surrounding the cylinder 1.
  • the aforementioned enclosure 10 is delimited, externally, by an envelope 11 of generally annular shape, the top of which is integral with a sleeve 12 mounted to slide axially around the upper part of the cylinder 1.
  • the envelope 11, for example made of elastomer, can be fixed to the sleeve 12 by means of a clamp 13.
  • the upper part of the cylinder 1, closed by a cover 14, carries a cylinder head 15 provided with the handle or handles of the device and having a skirt partially surrounding the sleeve 12.
  • the parts located opposite belonging to the sleeve 12 and to the skirt of the cylinder head 15, define with two rings 16 and 17 an annular space, in which is housed and compressed a spring 18, the two ends of which bear on flat rings, respectively 19 and 20
  • the spring 18 thus mounted constitutes an elastic suspension of low stiffness, acting in both directions, for the assembly formed by the casing 11 and the sleeve 12.
  • the envelope 11 is tightened so as to provide, between the outer wall of the cylinder 1 and the lower edge of said envelope 11, an annular passage 21 of small width d over the entire perimeter of the device.
  • the compressed air escaping from the upper chamber 6 or from the lower chamber 7, through the ports 9, is previously expanded in the annular enclosure 10, delimited by the external wall of the cylinder 1 and the inner wall of the envelope 11. Then this air is evacuated into the atmosphere through the annular passage 21, which constitutes an exhaust duct of determined section and of small width suitable for maximum attenuation of the exhaust noise .
  • the cylinder 1, subjected to the alternating reactions of the forces developed by the compressed air on the piston 3, moves at the striking frequency of the hammer.
  • the sliding sleeve, on the envelope is also integral with the cylinder head provided with the handle (s) of the device, so that it is the envelope-sleeve assembly which is suspended relative to the air hammer cylinder, unlike the example described where the cylinder head is rigidly linked to the cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Earth Drilling (AREA)
  • Surgical Instruments (AREA)
  • Exhaust Silencers (AREA)
  • Electrostatic Separation (AREA)

Claims (6)

1. Schalldämpfer für Preßlufthämmer, mit einem Ringraum (10), in dem sich die aus dem Zylinder (1) des Gerätes ausströmende Druckluft vor ihrem Entweichen in die Atmosphäre durch einen Durchtritt (21) geringer Weite (d) hindurch entspannt, wobei der Ringraum (10) zwischen der Außenwand des Zylinders (1) und der Innenwand einer den Zylinder (1) umgebenden Umhüllung (11) gebildet ist, dadurch gekennzeichnet, daß die Umhüllung (11) an ihrem oberen Ende fest mit einer Muffe oder Hülse (12) verbunden ist, die in axialer Richtung gleitbar auf dem oberen Bereich des Zylinders (1) sitzt, während der untere Bereich der Umhüllung (11) verengt ist und den Durchtritt (21) geringer Weite (d) und ringförmiger Gestalt um die Außenwand des Zylinders (1) herum begrenzt, wobei die von der Umhüllung (11) und der Muffe oder Hülse (12) gebildete Einheit elastisch am Zylinder (1) aufgehängt ist.
2. Schalldämpfer nach Anspruch 1, dadurch gekennzeichnet, daß die bewegliche Umhüllung (11) aus einem Elastomer hergestellt ist.
3. Schalldämpfer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die gleitbare, fest mit der Umhüllung (11) verbundene Muffe oder Hülse (12) durch Zwischenschalten mindestens einer Feder (18) elastisch am Zylinder (1) des Preßlufthammers aufgehängt ist.
4. Schalldämpfer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die gleitbare, fest mit der Umhüllung (11) verbundene Muffe oder Hülse (12) durch Zwischenschalten einer Drucklufteinrichtung elastisch am Zylinder (1) des Preßlufthammers aufgehängt ist.
5. Schalldämpfer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die gleitbare, fest mit der Umhüllung (11) verbundene Muffe oder Hülse (12) elastisch an einem Kopfstück (15) aufgehängt ist, das vom oberen Ende des Zylinders (1) des Preßlufthammers getragen wird und mit dem oder den Geräte- griff(en) versehen ist.
6. Schalldämpfer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die gleitbare, fest mit der Umhüllung (11) verbundene Muffe oder Hülse (12) außerdem mit einem Kopfstück fest verbunden ist, das mit dem oder den Gerätegriff(en) versehen ist, wobei die Einheit Umhüllung-Muffe oder Hülse-Kopfstück elastisch mit Bezug auf den Zylinder des Preßlufthammers aufgehängt ist.
EP80420060A 1979-05-22 1980-05-13 Schalldämpfer für Drucklufthammer Expired EP0019568B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80420060T ATE691T1 (de) 1979-05-22 1980-05-13 Schalldaempfer fuer drucklufthammer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7913912A FR2457152A1 (fr) 1979-05-22 1979-05-22 Silencieux pour marteau pneumatique
FR7913912 1979-05-22

Publications (3)

Publication Number Publication Date
EP0019568A1 EP0019568A1 (de) 1980-11-26
EP0019568B1 true EP0019568B1 (de) 1982-02-17
EP0019568B2 EP0019568B2 (de) 1986-01-15

Family

ID=9226058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80420060A Expired EP0019568B2 (de) 1979-05-22 1980-05-13 Schalldämpfer für Drucklufthammer

Country Status (6)

Country Link
US (1) US4558763A (de)
EP (1) EP0019568B2 (de)
AT (1) ATE691T1 (de)
DE (1) DE3060201D1 (de)
ES (1) ES491591A0 (de)
FR (1) FR2457152A1 (de)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE432375B (sv) * 1982-09-16 1984-04-02 Atlas Copco Ab Anordning vid ljuddempare till tryckluftdrivet slagverktyg
US4879847A (en) * 1989-03-13 1989-11-14 Snap-On Tools Corporation Cover for pneumatic tool
DE4110261A1 (de) * 1991-03-28 1992-10-01 Krupp Maschinentechnik Schalldaemmeinrichtung an einem handgefuehrten, fluidbetriebenen schlag- oder bohrwerkzeug
US5259462A (en) * 1992-08-28 1993-11-09 Ingersoll-Rand Company Soft mount air distributor
US5418339A (en) * 1993-11-04 1995-05-23 Minnesota Mining And Manufacturing Company Pneumatic tool having noise reducing muffling structure
JP2003501282A (ja) * 1999-06-10 2003-01-14 マクドナルド、エアー、トゥールズ、リミテッド 空気ツール
US6547015B1 (en) 2001-03-29 2003-04-15 Snap-On Technologies, Inc. Elongated pneumatic tool with replaceable soft grip
US6932166B1 (en) 2002-12-03 2005-08-23 Paul Kirsch Pneumatic tool
US7478096B2 (en) * 2003-02-26 2009-01-13 Burnside Acquisition, Llc History preservation in a computer storage system
US7261181B2 (en) * 2004-06-03 2007-08-28 Caterpillar Inc. Detatchable muffler apparatus for pneumatic tools
DE102004031628A1 (de) * 2004-06-30 2006-02-02 Robert Bosch Gmbh Vorrichtung mit einer Innenschale und einer Außenschale eines Gehäuses einer Handwerkzeugmaschine
TWM268150U (en) * 2004-08-17 2005-06-21 Guo-Rung Liu Impact cylinder for reciprocal type pneumatic tool
US7681690B2 (en) * 2007-07-13 2010-03-23 Longyear Tm, Inc. Noise abatement device for a pneumatic tool
US8196674B2 (en) * 2008-03-05 2012-06-12 Makita Corporation Impact tool
US7735603B2 (en) * 2008-05-28 2010-06-15 Longyear Tm, Inc. Noise reducing device for a pneumatic tool
US8215449B2 (en) * 2009-12-02 2012-07-10 Longyear Tm, Inc. Muffler system for noise abatement and ice control

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1644030A (en) * 1926-08-04 1927-10-04 Ingersoll Rand Co Handle for rock drills
US2058583A (en) * 1935-12-23 1936-10-27 Independent Pneumatic Tool Co Cushioned handle for tools
US2830560A (en) * 1955-10-05 1958-04-15 Doeden Tool Corp Air-operated hand tool
US2899934A (en) * 1956-01-19 1959-08-18 salengro
FR1353634A (fr) * 1963-01-18 1964-02-28 Meudon Forges Atel équipement anti-bruit pour marteau pneumatique
BE649108A (de) * 1963-06-10
FR1416101A (fr) * 1964-11-19 1965-10-29 Cons Mining & Smelting Co Silencieux pour outils pneumatiques percutants
US3526293A (en) * 1968-06-13 1970-09-01 Gardner Denver Co Muffler for fluid actuated tool
US3554316A (en) * 1969-11-25 1971-01-12 Chicago Pneumatic Tool Co Detachable elastomer muffler for pneumatic percussive tools
SU482286A1 (ru) * 1972-10-03 1975-08-30 Институт Горного Дела Ан Ссср Пневматический бетонолом
US3809179A (en) * 1973-04-18 1974-05-07 Dresser Ind Exhaust muffler for pneumatic tools
FR2282974A1 (fr) * 1974-08-29 1976-03-26 Baud Barthelemy Soufflet anti-bruit, notamment pour pistolets pneumatiques
US4079809A (en) * 1977-07-13 1978-03-21 The United States Of America As Represented By The Secretary Of The Interior Muffler for pneumatic drill
DE2827279C2 (de) * 1978-06-21 1986-06-12 Signode Corp., Glenview, Ill. Abluftschalldämpfer für tragbare pneumatische Eintreibgeräte

Also Published As

Publication number Publication date
ES8101444A1 (es) 1980-12-16
FR2457152A1 (fr) 1980-12-19
EP0019568B2 (de) 1986-01-15
ES491591A0 (es) 1980-12-16
US4558763A (en) 1985-12-17
EP0019568A1 (de) 1980-11-26
FR2457152B1 (de) 1982-07-09
DE3060201D1 (en) 1982-03-25
ATE691T1 (de) 1982-03-15

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